Optical pickup device, and information recording and reproduction device
AssigneePioneer Corporation
InventorsNaoharu Yanagawa, Fumihiko Sano
Life of this patent
Estimating the term…
Abstract
A sufficient S/N ratio in reproduction of an optical disk is achieved without complexing a circuit structure even if a data recording speed relative to the optical disk is increased. When data is recorded into an optical disk (DK), in an information recording and reproduction device (RP), both a first light beam and a second light beam are emitted at the same time. A sub-actuator section (20) is provided in addition to a main actuator (15) for correcting the displacement of light collecting spots caused by the displacement between the optical axis of the first beam and the optical axis of the second beam. Only the optical axis of the second light beam is adjusted by the sub-actuator section (20).
Claims14
An optical pickup apparatus which has a first light source and a second light source which simultaneously irradiate a first optical beam and a second optical beam on an information recording medium and receives reflected beams of the first optical beam and the second optical beam from the information recording medium, the optical pickup apparatus comprising:
- an objective lens for focusing the first optical beam and the second optical beam on the information recording medium;
- an irradiation position changing device having a sub-lens and displacing the sub-lens in focus directions, tracking directions, and jitter directions of the second optical beam to displace a focus irradiation position of the second optical beam for changing the focus irradiation position of the second optical beam on the information recording medium;
- a splitter device for splitting the reflected beams into a first reflected beam serving as the reflected beam of the first optical beam and a second reflected beam serving as the reflected beam of the second optical beam respectively;
- a light-receiving device for receiving the first reflected beam to output a first light-receiving signal and which receives the second reflected beam to output a second light-receiving signal;
- and
- a control device for controlling the irradiation position changing device on the basis of the second light-receiving signal to correct displacement of the focus irradiation position of the second optical beam with respect to the focus irradiation position of the first optical beam.
An information recording and reproduction apparatus including an optical pickup apparatus which has a first light source and a second light source which simultaneously irradiate a first optical beam and a second optical beam on an information recording medium and receives reflected beams of the first optical beam and the second optical beam from the information recording medium, the optical pickup apparatus comprises:
- an objective lens for focusing the first optical beam and the second optical beam on the information recording medium;
- an irradiation position changing device having a sub-lens and displacing the sub-lens in focus directions, tracking directions, and jitter directions of the second optical beam to displace a focus irradiation position of the second optical beam for changing the focus irradiation position of the second optical beam;
- a splitter device for each splitting the reflected beams into a first reflected beam serving as the reflected beam of the first optical beam and a second reflected beam serving as the reflected beam of the second optical beam;
- a light-receiving device for receiving the first reflected beam to output a first light-receiving signal and which receives the second reflected beam to output a second light-receiving signal;
- and
- a control device for controlling the irradiation position changing device on the basis of the second light-receiving signal to correct displacement of the focus irradiation position of the second optical beam with respect to the focus irradiation position of the first optical beam.
Dependencies are inferred from the claim text.